概略介绍了三门峡大坝的安全监测更新改造设计，简述了更新改造的必要性、监测项目、方法及其布置。同时还对重要的观测项目－正、倒垂线、引张线、扬压力、静力水准仪器设备选型作了概述。 This paper briefly introduces the design of safety monitoring and renovation of Sanmenxia Dam, and briefly introduces the necessity of renovation and improvement, monitoring items, methods and layouts. At the same time, it also gives an overview of the important observation items - positive, inverted vertical, drawing line, uplift pressure, static level equipment selection.